You made garbage day way more fun than I would have expected. As for music as mentioned below, soundimage.org has some *high* quality free stuff if you're willing to give the guy who runs it credit.
The game itself was pretty smooth. The HTML build took me quite a while to load on my machine, but I doubt that's because of your game. Was this in GLES3 though? If so, might be better to export HTML in GLES2 for people like me with potatoes. :) Overall, I liked it and feel like it could be turned into a pretty interesting little game.